OAM supplies an interface to scratch volume from the OAM Object database when all of the data has expired.
The CBRUXTVS exit will update the scratch indictor within CA-1.
When tape data sets are defined to OAM as objects, OAM controls their expiration. When OAM in its External Data Manager (EDM) role expires a tape, it must notify CA 1 so the tape can be scratched and reused. This notification is performed by calling the CBRUXTVS_EXIT entry point in the ARCTVEXT module. To enable this dynamic exit entry point, you update SYS1.PARMLIB member PROGnn with the following entry:
EXIT ADD EXITNAME(CBRUXTVS_EXIT) MODNAME(ARCTVEXT) STATE(ACTIVE)
The exit can also be enabled dynamically with the SETPROG EXIT MVS command.
This exit is only supported by OAM in z/OS 1.7 and higher operating systems.
For more information on this interface, refer to the IBM z/OS DFSMS manual Using the New Functions (SC26-7473-11).